Electromagnetic friction-coupling.



P. FORSTER. ELECTROMAGNETIC FRICTION COUPLING,

APPLICATION FILED JUNE 5, 1913.

1,122,380, Patnted Dec.29. 1914.

PAOLQ rons'rna, or ruam, ITALY.

nfncrnomaenmrc rarcrron-courniue.

To all whom it may concern:

' Be itknown that I, PAOLO FoRsrnR, engineer, of Via-San Quintino 47,. Turin, Italy, have invented certain new and .useful Improvements 'in Electromagnetic Friction- Couplings, of which the following is a full,

clear, and exact specification.-

Thisinvention relates to electromagnetically operated friction devices by which the rotation of one shaft relative to a secondshaft'is permitted or precluded, of the type in which, on theproduction of the magnetic -'field, relative motion in a. longitudinal di--' rection, between two members rotatedwith one shaft, 1s produced, which members as a resultarecaused to come in contact with the frictional surfaces of a member rotatably mounted on a second shaft.

. being so disposed that it tapers in-the reverse direction to a corresponding frustum,

and in which the frictional surfaces of the members rotated with the first mentioned shaft are correspondingly formed, in order to insure the maximum surface of contact formed as the frusta of two cones, having adjacent bases. A member 4 is keyed to a second shaft.

mounted on the sleeve-7 about which it is capable of rotation. hen the member 4 is rotated'the second member 5, 6 is also rotated due to studs or the like being provided on the member 4-, said studs engaging A second member 5, 6 is Specification of Letters Patent. 7 Y Patentedlj 29, 1-914 Application filed June 5,1913. Seria1No. 771,954. i i

registering depressions formed in theme'mbers o, 6. The second half member 5 is preferably formed of two parts, one being capable of movement with respect to the" other for the purpose of adjustment due to frictional wear. In the construction illustrated, the member -.6 is provided with an external thread and-the member 5 with a corresponding internal thread.

The devices provided on the member 4 for the purpose of insuring the rotation of theznember 5, -6 must be formed so'as to permit relative IIlO'tlOll in a longitudinal direction between the two members.

The operation of the clutch is as follows:

\Vhen current fiows through the coils-2 a magnetic field is. produced and the member 5, 6 is thus displaced in a longitudinal direction, approaching the member 4. In

itsimovement, it comes in contact with the conical portion 3 of the sleeve 7 and moves this member in relation to the shaft on which it is mounted. By this further movement the other conical surface of the member?) is brought into contact with the corresponding surface of the. member 4. The enlarged portion 3 of. the member 7. is thus seeurelygripped. v

The above mentioned is a preferred em-v bodiment of my invention, although I do not limit myself to the construction shown as the parts may be reversed with relation to the driving anddriven shaft, without departing from the scope of my invention.

'I claim:

An .electroma'gnetically operated friction device comprising two shafts, sa'id shafts adapted to rotate independently of each o'ther,.a non-magnetic member keyed to one of said shafts having its sides formed of a plurality of frusta of cones having adjacent bases, a' two part magnetic memberhaving its sections spaced from each other,

one ofsaid parts being keyed to the other of saidsha-fts and having its inner surface adjacent to and of the contour of said first mentioned member, the second portion of said magnetic member seated on said nonmagnetic member and having its inner surface adjacent and of the contour of said nrst mentioned member, means to prevent In witness whereof I have hereunto independent rotation of said spaced magsigned by name in the presence of two netic members, and a magnet positioned 1nsubscribing wltnesses.

I termediate said magnetic members serving PAOLO: FORSTER. 5 to force said magnetic and non-magnetic Witnesses: I

portions into frictional contact, substan- C; L. FEYLES,

tially as described. FELICE PAZETTA. 

